Good day, In the process of doing some much needed engine upkeep on a 3HM35 and I found the heat exchanger case has some corrosion around the front seal and may not reseal or at least not for very long. There is quite a bit of additional corrosion around the front of the same case. The local yanmar shop said they looked for a replacement to no avail. Perhaps someone here knows of a lead?
That said I’m not entirely opposed to dropping a new engine in because the heat exchanger isn’t the only issue and I don’t even know the serial number because the ID plate fell off before I became the owner and who knows the total hours. My understanding is these boats were originally fitted with the 3QM30 but at some point a 3HM35 with 2 bladed folding prop was installed in mine. My question is if a 3YM30AE would be a sufficient replacement. The local shop points out the higher rpm of the 3YM and believes it would be underpowered compared to the current 3HM and is suggesting a 3JH40. I’m interested to hear any thoughts or experiences you might have. Thanks in advance! Jacob Fuerst 303-520-4669 1978 C&C 36 Ventura, CA
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